I read somewhere that formating an HD, even after 10 times,some data can be fully recovered(with etx3 fs).With what utility or way can i format an HD so that nothing can be recovered ??(with partition magic doing "format and secure") But i prefer a utility that can fit in a disk or a linux utility.Any suggestions/recommendations are welcome

What you hiding?

I don't know of any single disk program capable of retrieving data from a formatted disk. Usually a regular format, most poeple won't be able to retrieve the data unless they take it to a specialty place and pay high costs to get the data from the disk. And 10 times, I've seen some companies stating they've extracted data from disks that were caught in a burning building, etc.

I'd love to see someone recover a harddrive that has been "zero wrttien" meaning all "1" replaced with "0" to the whole disk contains "0's" even MBR...lol

Recover that!

Actually it is possbile, like trickykid said, some company are expertized in such operations.

For that you have to open the drive.

The technology is simple. When you write zero, it's not 0, it's maybe 0.002 if there was a 1 before and 0.00001 if it was zero before.
Each bit has like a "memory" of the precedent values it had

I hope I was clear

Cheers

There are windows programs that claim to be able to securely delete a partition. Partition Magic may be one on them.

As far as securely erasing files, there is the shred program.

These programs work by repeatedly writing over the file with zeros and random values.

well i have to send my laptop for repair an i want nothing to be exposed.But except that i find it as a good idea to clear completely your disk after a format so that no-one that could have access to your computer(legally or not ) can recover nothing.But from what i read cfdisk will do the job unless someone is willing to pay a large amount of money Therefore a more interesting program will be one that competely removes a file after you have delete it, like jschiwal mentioned.But could a program like that "harm" to your filesystem?? Could the use of it result to any data loss ??